Lawmakers could begin 2018 by passing a package of disaster-aid relief and adding about $200 billion to federal spending

WASHINGTON—While many Republicans celebrated the recent passage of their tax overhaul, some worry the party’s year in control of Congress and the White House has done little to rein in federal spending.

Fiscal restraint has been a watchword for the party for decades. But various actions this year, including the tax rewrite, are expected to add to the federal deficit, with spending likely to increase in 2018.

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